[INFO] fetching crate godrays 0.1.0...
[INFO] checking godrays-0.1.0 against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] extracting crate godrays 0.1.0 into /workspace/builds/worker-6-tc2/source
[INFO] started tweaking crates.io crate godrays 0.1.0
[INFO] finished tweaking crates.io crate godrays 0.1.0
[INFO] tweaked toml for crates.io crate godrays 0.1.0 written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate godrays 0.1.0 on toolchain 4f260f0f20b3133d20cfb50353c0221943af5796
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate godrays 0.1.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] ae00a988ce8b36c2695c6530f13876b9f10c7be94c9b0fe33d3e0fd4572ef820
[INFO] running `Command { std: "docker" "start" "-a" "ae00a988ce8b36c2695c6530f13876b9f10c7be94c9b0fe33d3e0fd4572ef820", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ae00a988ce8b36c2695c6530f13876b9f10c7be94c9b0fe33d3e0fd4572ef820", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ae00a988ce8b36c2695c6530f13876b9f10c7be94c9b0fe33d3e0fd4572ef820", kill_on_drop: false }`
[INFO] [stdout] ae00a988ce8b36c2695c6530f13876b9f10c7be94c9b0fe33d3e0fd4572ef820
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid -Dunmustuse_in_always_ok" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a73302f18b46bd0bc09ac401c8bb47a7d4657d28c5331f90a6322156c4d8a057
[INFO] running `Command { std: "docker" "start" "-a" "a73302f18b46bd0bc09ac401c8bb47a7d4657d28c5331f90a6322156c4d8a057", kill_on_drop: false }`
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[INFO] [stdout] warning: unused import: `std::sync::Arc`
[INFO] [stdout]  --> src/lib.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::sync::Arc;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `async_std::prelude::FutureExt`
[INFO] [stdout]  --> src/lib.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use async_std::prelude::FutureExt;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crossbeam_skiplist::SkipMap`
[INFO] [stdout]  --> src/lib.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use crossbeam_skiplist::SkipMap;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `libp2p::swarm::NetworkBehaviour`
[INFO] [stdout]  --> src/lib.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use libp2p::swarm::NetworkBehaviour;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Receiver`
[INFO] [stdout]  --> src/core/mdns.rs:3:23
[INFO] [stdout]   |
[INFO] [stdout] 3 | use async_broadcast::{Receiver, Sender};
[INFO] [stdout]   |                       ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `async_std::stream::interval`
[INFO] [stdout]  --> src/core/mdns.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use async_std::stream::interval;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `ClusterAddresses`
[INFO] [stdout]   --> src/core/mdns.rs:17:32
[INFO] [stdout]    |
[INFO] [stdout] 17 | use crate::core::clusteraddr::{ClusterAddresses, DiscoveredAddr};
[INFO] [stdout]    |                                ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::net::IpAddr`
[INFO] [stdout]  --> src/core/clusteraddr.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::net::IpAddr;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `log::info`
[INFO] [stdout]  --> src/core/clusteraddr.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use log::info;
[INFO] [stdout]   |     ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::sync::Arc`
[INFO] [stdout]  --> src/lib.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::sync::Arc;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `async_std::prelude::FutureExt`
[INFO] [stdout]  --> src/lib.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use async_std::prelude::FutureExt;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crossbeam_skiplist::SkipMap`
[INFO] [stdout]  --> src/lib.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use crossbeam_skiplist::SkipMap;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `libp2p::swarm::NetworkBehaviour`
[INFO] [stdout]  --> src/lib.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use libp2p::swarm::NetworkBehaviour;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Receiver`
[INFO] [stdout]  --> src/core/mdns.rs:3:23
[INFO] [stdout]   |
[INFO] [stdout] 3 | use async_broadcast::{Receiver, Sender};
[INFO] [stdout]   |                       ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `async_std::stream::interval`
[INFO] [stdout]  --> src/core/mdns.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use async_std::stream::interval;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `ClusterAddresses`
[INFO] [stdout]   --> src/core/mdns.rs:17:32
[INFO] [stdout]    |
[INFO] [stdout] 17 | use crate::core::clusteraddr::{ClusterAddresses, DiscoveredAddr};
[INFO] [stdout]    |                                ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::net::IpAddr`
[INFO] [stdout]  --> src/core/clusteraddr.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::net::IpAddr;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `log::info`
[INFO] [stdout]  --> src/core/clusteraddr.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use log::info;
[INFO] [stdout]   |     ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `key`
[INFO] [stdout]   --> src/core/mdns.rs:43:30
[INFO] [stdout]    |
[INFO] [stdout] 43 |             .with_behaviour(|key| behavior)
[INFO] [stdout]    |                              ^^^ help: if this is intentional, prefix it with an underscore: `_key`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `tx`
[INFO] [stdout]   --> src/core/mdns.rs:30:46
[INFO] [stdout]    |
[INFO] [stdout] 30 |     pub fn new(local_key: identity::Keypair, tx: Sender<DiscoveredAddr>) -> Result<Self> {
[INFO] [stdout]    |                                              ^^ help: if this is intentional, prefix it with an underscore: `_tx`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `rx`
[INFO] [stdout]   --> src/lib.rs:25:18
[INFO] [stdout]    |
[INFO] [stdout] 25 |         let (tx, rx) = async_broadcast::broadcast(1_000);
[INFO] [stdout]    |                  ^^ help: if this is intentional, prefix it with an underscore: `_rx`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `local_key`, `local_peer_id`, and `expected_listener_id` are never read
[INFO] [stdout]   --> src/core/mdns.rs:22:5
[INFO] [stdout]    |
[INFO] [stdout] 21 | pub struct GodraysMdns {
[INFO] [stdout]    |            ----------- fields in this struct
[INFO] [stdout] 22 |     local_key: identity::Keypair,
[INFO] [stdout]    |     ^^^^^^^^^
[INFO] [stdout] 23 |     local_peer_id: PeerId,
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout] 24 |     expected_listener_id: ListenerId,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `GodraysMdns` has a derived impl for the trait `Clone`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: std::result::Result<SwarmBuilder<libp2p::builder::phase::provider::AsyncStd, libp2p::builder::phase::swarm::SwarmPhase<impl libp2p::builder::phase::AuthenticatedMultiplexedTransport, libp2p::libp2p_mdns::Behaviour<AsyncIo>>>, Infallible>
[INFO] [stdout]   --> src/core/mdns.rs:35:66
[INFO] [stdout]    |
[INFO] [stdout] 35 |           let mut swarm: Swarm<libp2p::mdns::Behaviour<AsyncIo>> = libp2p::SwarmBuilder::with_existing_identity(local_key.clone())
[INFO] [stdout]    |  __________________________________________________________________^
[INFO] [stdout] 36 | |             .with_async_std()
[INFO] [stdout] 37 | |             .with_tcp(
[INFO] [stdout] 38 | |                 tcp::Config::default(),
[INFO] [stdout] ...  |
[INFO] [stdout] 42 | |             .map_err(|e| GodraysError::GeneralError(e.to_string()))?
[INFO] [stdout] 43 | |             .with_behaviour(|key| behavior)
[INFO] [stdout]    | |___________________________________________^
[INFO] [stdout]    |
[INFO] [stdout]    = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `finish` that must be used
[INFO] [stdout]   --> src/core/clusteraddr.rs:40:9
[INFO] [stdout]    |
[INFO] [stdout] 40 |         state.finish();
[INFO] [stdout]    |         ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 40 |         let _ = state.finish();
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `godrays` (lib) due to 1 previous error; 14 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: unused variable: `key`
[INFO] [stdout]   --> src/core/mdns.rs:43:30
[INFO] [stdout]    |
[INFO] [stdout] 43 |             .with_behaviour(|key| behavior)
[INFO] [stdout]    |                              ^^^ help: if this is intentional, prefix it with an underscore: `_key`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `tx`
[INFO] [stdout]   --> src/core/mdns.rs:30:46
[INFO] [stdout]    |
[INFO] [stdout] 30 |     pub fn new(local_key: identity::Keypair, tx: Sender<DiscoveredAddr>) -> Result<Self> {
[INFO] [stdout]    |                                              ^^ help: if this is intentional, prefix it with an underscore: `_tx`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `rx`
[INFO] [stdout]   --> src/lib.rs:25:18
[INFO] [stdout]    |
[INFO] [stdout] 25 |         let (tx, rx) = async_broadcast::broadcast(1_000);
[INFO] [stdout]    |                  ^^ help: if this is intentional, prefix it with an underscore: `_rx`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `local_key`, `local_peer_id`, and `expected_listener_id` are never read
[INFO] [stdout]   --> src/core/mdns.rs:22:5
[INFO] [stdout]    |
[INFO] [stdout] 21 | pub struct GodraysMdns {
[INFO] [stdout]    |            ----------- fields in this struct
[INFO] [stdout] 22 |     local_key: identity::Keypair,
[INFO] [stdout]    |     ^^^^^^^^^
[INFO] [stdout] 23 |     local_peer_id: PeerId,
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout] 24 |     expected_listener_id: ListenerId,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `GodraysMdns` has a derived impl for the trait `Clone`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: std::result::Result<SwarmBuilder<libp2p::builder::phase::provider::AsyncStd, libp2p::builder::phase::swarm::SwarmPhase<impl libp2p::builder::phase::AuthenticatedMultiplexedTransport, libp2p::libp2p_mdns::Behaviour<AsyncIo>>>, Infallible>
[INFO] [stdout]   --> src/core/mdns.rs:35:66
[INFO] [stdout]    |
[INFO] [stdout] 35 |           let mut swarm: Swarm<libp2p::mdns::Behaviour<AsyncIo>> = libp2p::SwarmBuilder::with_existing_identity(local_key.clone())
[INFO] [stdout]    |  __________________________________________________________________^
[INFO] [stdout] 36 | |             .with_async_std()
[INFO] [stdout] 37 | |             .with_tcp(
[INFO] [stdout] 38 | |                 tcp::Config::default(),
[INFO] [stdout] ...  |
[INFO] [stdout] 42 | |             .map_err(|e| GodraysError::GeneralError(e.to_string()))?
[INFO] [stdout] 43 | |             .with_behaviour(|key| behavior)
[INFO] [stdout]    | |___________________________________________^
[INFO] [stdout]    |
[INFO] [stdout]    = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `finish` that must be used
[INFO] [stdout]   --> src/core/clusteraddr.rs:40:9
[INFO] [stdout]    |
[INFO] [stdout] 40 |         state.finish();
[INFO] [stdout]    |         ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 40 |         let _ = state.finish();
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `godrays` (lib test) due to 1 previous error; 14 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "a73302f18b46bd0bc09ac401c8bb47a7d4657d28c5331f90a6322156c4d8a057", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a73302f18b46bd0bc09ac401c8bb47a7d4657d28c5331f90a6322156c4d8a057", kill_on_drop: false }`
[INFO] [stdout] a73302f18b46bd0bc09ac401c8bb47a7d4657d28c5331f90a6322156c4d8a057
